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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77af8027d5d596a7a1886e1e4a3ef3e0173a7d289544864c5e19cb4baaea06f4' 
  AND token = 'Bml2ZCNOfetVX+6gCUtFSdk+lpSgL9wukSD6yXHw5tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}